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APPARATUS FOR PROPELLING BOATS OR VESSELS.

SPECIFICATION forming part of Letters Patent No. 515,642, dated February 27, 1894.

Application filed June 15,1893. Serial No. 477.740. (No model.) Patented in England September 1, 189Z,N0- 15,69 111 France June 6, 1893, No. 230,660, and in Germany June 9,1893, No. 73,239-

To all whom it may concern:

Be it known that I, HENRY Bnnononr, a citizen of England, residing at The Glen, Newry, 1n the county of Armagh, Ireland, have inyented certain new and useful Improvements in Apparatus for Propelling Boats or other Navigable Vessels, (for which I have obtained Letters Patent in Great Britain, dated September 1, 1892, No. 15,693; in France, dated June 6, 1893, No. 230,660, and in Germany, dated June 9, 1893, No. 73,239,) of which the following is a specification.

In the specification to my Patent No. 4:76,122 of May 31,1892,I described a construction of apparatus for propelling and steering boats and other navigable vessels in which two sets of propeller blades revolving in contrary directions were mounted on avertically sliding frame carried by horizontal supports overhanging the stern of the boat amidships, the frame with the propellers being raised or lowered to suit the varying water line of the boat, while the horizontal supports were mounted ona turntable so as to cause the propeller axis to assume angular positions for steering the boat.

According to my present improvements I simplify the construction of such apparatus by dispensing with the one set of propeller blades, and arranging the same in such mannor that an ordinary rudder can be used for steering so that the mounting of the framing on a turntable for efitectin g the steering is also dispensed with. The apparatus is by this means rendered very simple and inexpensive, and capable of being readily placed in position and removed, so that it may be applied with great advantage not only to barges, but also to sailing ships as auxiliary propelling power. For this purposel construct the vertical frame with its vertical shaft and driving gear in a similar manner to that described in my said prior specification, but in place of providing two sets of propeller blades made to revolve in contrary directions, I provide only a single set of blades, and instead of placing the horizontal supports so as to overhang the stern amidships, I, according to one arrangement, place them to such an extent to one side of the stern post that'the propeller blades in revolving will just clear the latter. Furthermore, when necessary I extend the stern post outward to such an extent that an ordinary rudder hinged thereto can be made to assume the extreme angular position required for steering without interfering with the vertical frame and its propeller blades.

The vertical shaft of the propeller blades may be driven in any of the ways described in my said specification, such as by a small portable motor engine and boiler on deck or by an electric or other suitable motor, the whole apparatus being so arranged as to be readily placed in position and removed, so as to be capable of being transferred from one barge to another when required, thus enabling one set of propelling apparatus to serve for two barges, one of which is being loaded or unloaded at the one end station, while the other is performing the journey to and from the other end station.

With the single set of propeller blades, immersed only to near their horizontal axis, there would of course be a tendency to alerteral displacement of the stern of the vessel due to the lateral thrust exercised by the blades. I counteract this however by causing the propeller blades in passing through the water to revolve in the direction away from the stern post, so that the lateral thrust will then tend to turn the stern of the boat in the contrary direction to that in which the boat tends to turn owing to the lateral position of the propeller relatively to the longitudinal center line of the boat.

\Vhen applying the apparatus to larger vessels, two sets thereof might be employed, one on each side of the rudder, and one or more others might also be arranged on each side of the vessel if necessary.

On the accompanying drawings are shown two modifications of the above described propeller apparatus.

Figure 1 shows a rear view; Fig. 2, a side view, and Fig. 3 a plan of one arrangement; Fig. 4, a front view partly in section; Fig. 5, a side view partly in section; Fig. 6, a plan of the second arrangement. Fig. 7, is a part vertical section of the lower end portion of the construction shown in Figs. 1 and 2;

R and having a bevel wheel 0 gearing with the bevel wheel Non the shaftI substantially as described.

2. In apparatus for propelling boats and other navigable vessels by means of propellers carried bya frame overhanging the stern of the boat, the combination of horizontal bearersA A overhanging the stern of the boat a frame adj ustably secured to the bearers by loop or eye bolts passing longitudinally through the beams A and adapted to nip the said frame against the ends of the bearers, so as to secure the same in an easily removable manner, a grooved shaft I carried in bearings at the upper and lower ends of the said frame, bevel gear J N on the said shaft, an

axis R projecting on the outer side of the lower part of said frame, and a single set of propeller blades Q carried by a boss running loose on the axis B and havinga bevel wheel 0 gearing with the bevel wheel N on the shaft I substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 30th day of z 5 May, A. D. 1893.

HENRY BARGROFT.

Vitnesses:

J OSEPH FISHER,

Ship Broker, Newry. HUNTER MOORE,

Public Notary, N awry. 

